public Double evaluate()

in src/main/java/org/apache/datasketches/hive/tuple/DoubleSummarySketchToPercentileUDF.java [57:71]

• 15 lines of code
• 5 McCabe index (conditional complexity)

  public Double evaluate(final BytesWritable serializedSketch, final double percentile) {
    if (serializedSketch == null) { return null; }
    if ((percentile < 0) || (percentile > 100)) {
      throw new IllegalArgumentException("percentile must be between 0 and 100");
    }
    final Sketch<DoubleSummary> sketch =
        Sketches.heapifySketch(BytesWritableHelper.wrapAsMemory(serializedSketch), SUMMARY_DESERIALIZER);
    if (sketch.isEmpty()) { return Double.NaN; }
    final UpdateDoublesSketch qs = DoublesSketch.builder().setK(QUANTILES_SKETCH_K).build();
    final TupleSketchIterator<DoubleSummary> it = sketch.iterator();
    while (it.next()) {
      qs.update(it.getSummary().getValue());
    }
    return qs.getQuantile(percentile / 100);
  }